[machinehop5]

need more Chip Load to carry the Heat away from Endmill...
What is the SFPM is the key cutting anything.
https://robbjack.com/formulas/

[trurle]

need more Chip Load to carry the Heat away from Endmill...
What is the SFPM is the key cutting anything.
https://robbjack.com/formulas/

This is a common sense answer. Unfortunately, feed rate is already at stepper limit, and cooling seems to have no effect. Overheat indeed happens, but it seems to be consequence of problem rather than root cause. Some other explanation?

[wmgeorge]

This is a common sense answer. Unfortunately, feed rate is already at stepper limit, and cooling seems to have no effect. Overheat indeed happens, but it seems to be consequence of problem rather than root cause. Some other explanation?

Its all about Chip Load. Look at GWizard from CNC Cookbook. You can download a free trial and then decide if its worth the cost. Use 2 or 1 flute mills for wood, same as aluminum.

For example I used it set up for mine, (3 Hp spindle 9000-24000 Rpm) and on Hardwood using a 2 flute HSS 1/2 inch EM .125 deep cut it came up with 12610 RPM and a Feed rate of 151 inches per minute. My machine can do that easy, not sure if yours can or not.